[Xen-devel] [PATCH-for-4.11 v2] xpti: fix bug in double fault handling

[Juergen Gross <jgross@xxxxxxxx>]

When entering the hypervisor via the double fault handler resetting
xen_cr3 was missing. This led to switching to pv_cr3 when returning
from the next following interrupt. So repair this in order to allow
interrupt handling to work even after a double fault.

Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
---
 xen/arch/x86/x86_64/entry.S | 1 +
 1 file changed, 1 insertion(+)

diff --git a/xen/arch/x86/x86_64/entry.S b/xen/arch/x86/x86_64/entry.S
index 45d9842d09..25427b0cec 100644
--- a/xen/arch/x86/x86_64/entry.S
+++ b/xen/arch/x86/x86_64/entry.S
@@ -773,6 +773,7 @@ ENTRY(double_fault)
         neg   %rbx
 .Ldblf_cr3_load:
         mov   %rbx, %cr3
+        movq $0, STACK_CPUINFO_FIELD(xen_cr3)(%r14)
 .Ldblf_cr3_okay:
 
         movq  %rsp,%rdi
-- 
2.13.6


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